Charging case

1. A charging case for charging a to-be-charged device having a battery and a charging management chip, comprising a control module, a charging case battery and a voltage conversion module; wherein the charging case battery is connected with the voltage conversion module; the voltage conversion module is configured for converting a direct current output by the charging case battery into a charging voltage and outputting the charging voltage to the charging management chip of the to-be-charged device so as to charge the battery of the to-be-charged device through the charging management chip; the control module is configured to regulate the charging voltage output by the voltage conversion module according to a voltage of the battery of the to-be-charged device during charging thereof by; calculating a charging voltage target value, the charging voltage target value being a sum value of a current voltage value of the battery of the to-be-charged device, a current voltage drop value of a charging pathway, and a charging threshold of the charging management chip; wherein the charging pathway is a pathway from an output end of the voltage conversion module to an input end of the charging management chip; and regulating the charging voltage output by the voltage conversion module according to the charging voltage target value.

2. The charging case according to claim 1, wherein the regulating the charging voltage output by the voltage conversion module according to the charging voltage target value comprises: if a voltage of the charging case battery is greater than the charging voltage target value, letting the charging voltage output by the voltage conversion module be the voltage of the charging case battery, or letting the voltage conversion module perform voltage dropping to make the charging voltage be equal to the charging voltage target value; if the voltage of the charging case battery is equal to the charging voltage target value, letting the charging voltage output by the voltage conversion module be the voltage of the charging case battery; or if the voltage of the charging case battery is less than the charging voltage target value, letting the voltage conversion module perform boosting to make the charging voltage be equal to the charging voltage target value.

3. The charging case according to claim 1, wherein the charging case comprises a memory, the memory storing therein a correspondence between the voltage drop value of the charging pathway and the voltage value of the battery of the to-be-charged device; and wherein the calculating a charging voltage target value comprises: searching a voltage drop value of the charging pathway corresponding to the current voltage value of the battery of the to-be-charged device to serve as the current voltage drop value of the charging pathway.

4. The charging case according to claim 1, wherein the voltage conversion module comprises a voltage conversion chip, a first resistor, a second resistor, a controlled switch, and a positive contact and a negative contact configured for connection with the to-be-charged device; the voltage conversion chip and the controlled switch are in parallel connection and are respectively connected between a positive electrode of the charging case battery and the positive contact, an input end of the voltage conversion chip being connected with the positive electrode of the charging case battery, and an output end of the voltage conversion chip being connected with the positive contact; the output end of the voltage conversion chip is connected with one end of the first resistor, the other end of the first resistor is connected with a first end of the second resistor, and a second end of the second resistor is grounded, a voltage feedback end of the voltage conversion chip is connected with the first end of the second resistor; the control module is connected respectively with an enabling end of the voltage conversion chip, a control end of the controlled switch, and a resistance regulating end of the second resistor; and a negative electrode of the charging case battery is connected with the negative contact.

5. The charging case according to claim 4, wherein the control module is configured such that: if a voltage of the charging case battery is greater than or equal to a charging voltage target value, the control module controls the voltage conversion chip to stop operation and controls the controlled switch to be switched on; and if the voltage of the charging case battery is less than the charging voltage target value, the control module controls the controlled switch to be switched off, and the control module controls the voltage conversion chip to boost and regulates the resistance of the second resistor, so as to let the charging voltage be equal to the charging voltage target value.

6. The charging case according to claim 4, wherein the second resistor is a digital resistor or a digital potentiometer.

7. The charging case according to claim 1, wherein the voltage conversion module comprises a voltage conversion chip, a third resistor, a fourth resistor, a resistor-capacitor network, a controlled switch, and a positive contact and a negative contact configured for connection with the to-be-charged device; the voltage conversion chip and the controlled switch are in parallel connection, and are respectively connected between a positive electrode of the charging case battery and the positive contact; an input end of the voltage conversion chip is connected with the positive electrode of the charging case battery, and an output end of the voltage conversion chip is connected with the positive contact; the output end of the voltage conversion chip is connected with one end of the third resistor, the other end of the third resistor is connected with a first end of the fourth resistor, and a second end of the fourth resistor is grounded, a voltage feedback end of the voltage conversion chip being connected with the first end of the fourth resistor; the resistor-capacitor network is connected between a pulse signal output end of the control module and the first end of the fourth resistor; the control module is connected respectively with an enabling end of the voltage conversion chip, and a control end of the controlled switch a negative electrode of the charging case battery is connected with the negative contact.

8. The charging case according to claim 7, wherein the control module is configured such that: if a voltage of the charging case battery is greater than or equal to a charging voltage target value, the control module controls the voltage conversion chip to stop operation and controls the controlled switch to be switched on; and if the voltage of the charging case battery is less than the charging voltage target value, the control module controls the controlled switch to be switched off, and the control module controls the voltage conversion chip to boost and regulates a duty ratio of a pulse signal output by the control module, so as to let the charging voltage be equal to the charging voltage target value.

9. The charging case according to claim 7, wherein the resistor-capacitor network comprises a fifth resistor, a sixth resistor, and a first capacitor; the fifth resistor and the sixth resistor are connected in series between the pulse signal output end of the control module and the first end of the fourth resistor; and one end of the first capacitor is connected between the fifth resistor and the sixth resistor, and the other end of the first capacitor is grounded.

10. The charging case according to claim 1, wherein the voltage conversion module comprises a voltage conversion chip, a seventh resistor, an eighth resistor, a ninth resistor, a controlled switch, a digital-to-analog conversion unit, and a positive contact and a negative contact configured for connection with the to-be-charged device; the voltage conversion chip and the controlled switch are in parallel connection, and are respectively connected between a positive electrode of the charging case battery and the positive contact; an input end of the voltage conversion chip is connected with the positive electrode of the charging case battery, and an output end of the voltage conversion chip is connected with the positive contact; the output end of the voltage conversion chip is connected with one end of the seventh resistor, the other end of the seventh resistor is connected with a first end of the eighth resistor, and a second end of the eighth resistor is grounded; a voltage feedback end of the voltage conversion chip is connected with the first end of the eighth resistor; a digital regulating signal output end of the control module is connected with an input end of the digital-to-analog conversion unit, an output end of the digital-to-analog conversion unit is connected with one end of the ninth resistor, and the other end of the ninth resistor is connected with the first end of the eighth resistor; the control module is connected with an enabling end of the voltage conversion chip, and a control end of the controlled switch respectively, a negative electrode of the charging case battery is connected with the negative contact.

11. The charging case according to claim 10, wherein the control module is configured such that: if a voltage of the charging case battery is greater than or equal to a charging voltage target value, the control module controls the voltage conversion chip to stop operation and controls the controlled switch to be switched on; if the voltage of the charging case battery is less than the charging voltage target value, the control module controls the controlled switch to be switched off, and the control module controls the voltage conversion chip to boost and regulates magnitude of a voltage output by the digital-to-analog conversion unit, so as to let the charging voltage be equal to the charging voltage target value.

12. The charging case according to claim 1, wherein the voltage conversion module comprises a voltage conversion chip, a tenth resistor, an eleventh resistor, a twelfth resistor, a digital-to-analog conversion unit, and a positive contact and a negative contact configured for connection with the to-be-charged device; an input end of the voltage conversion chip is connected with a positive electrode of the charging case battery, and an output end of the voltage conversion chip is connected with the positive contact; the output end of the voltage conversion chip is connected with one end of the tenth resistor, the other end of the tenth resistor is connected with a first end of the eleventh resistor, and a second end of the eleventh resistor is grounded; a voltage feedback end of the voltage conversion chip is connected with the first end of the eleventh resistor; a digital regulating signal output end of the control module is connected with an input end of the digital-to-analog conversion unit, an output end of the digital-to-analog conversion unit is connected with one end of the twelfth resistor, and the other end of the twelfth resistor is connected with the first end of the eleventh resistor; the control module is connected with an enabling end of the voltage conversion chip; a negative electrode of the charging case battery is connected with the negative contact.

13. The charging case according to claim 12, wherein the control module is configured to: control the voltage conversion chip to operate, and output a digital adjusting signal to let a charging voltage output by the voltage conversion chip be the charging voltage target value.